Mailbox post



FIG. 1 is a front, top, and left side perspective view of a mailbox post, showing my new design;

FIG. 2 is a left side elevation view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken lines and the unshaded surface areas adjacent to the broken lines shown in the drawing of FIG. 5 represent portions of the mailbox post that form no part of the claimed design. 

CLAIM The ornamental design for a mailbox post, as shown and described. 